Patents by Inventor Piet Krahmer

Piet Krahmer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Aluminium-strontium master alloy and process of making the alloy
    Patent number: 5205986
    Abstract: A process is described for the preparation of an aluminum-strontium master alloy suitable for use as structure refiner during the solidification of molten aluminum-silicon alloys, comprising atomizing a stream of molten alloy containing aluminum and 5 to 35% by weight of strontium and collecting atomized particles as solid material on a collecting surface.
    Type: Grant
    Filed: October 5, 1990
    Date of Patent: April 27, 1993
    Assignee: Shell Research Limited
    Inventors: Jan Noordegraaf, Piet Krahmer, Martin Donnelly
  • Copper alloy and process for its preparation
    Patent number: 5198044
    Abstract: Process for the preparation of a substantially homogeneous alpha phase copper-nickel-tin alloy comprising copper and 4-18% by weight of nickel and 3-13% by weight of tin, comprising atomizing a molten alloy having the before-indicated composition and collecting atomized particles on a collecting surface in such a way that solid collected material is obtained having a temperature, of at least 700.degree. C., followed by quick cooling of the collected material to a temperature below 300.degree. C.The alloy thus obtained may be hardened, preferably after shaping, by spinodal decomposition.
    Type: Grant
    Filed: April 9, 1991
    Date of Patent: March 30, 1993
    Assignee: Shell Research Limited
    Inventors: Jeroen Colijn, Gerrit J. H. Mol, Piet Krahmer, Allan D. Steele